dri/nouveau: Call _mesa_update_state() after framebuffer invalidation.

Previously nouveau_state_emit() was being called directly, sometimes
that doesn't work because it doesn't update the derived GL context.

src/mesa/drivers/dri/nouveau/nouveau_context.c

@@ -365,5 +365,6 @@ nouveau_validate_framebuffer(struct gl_context *ctx)
 		validate_framebuffer(dri_ctx, dri_read,
 				     &dri_ctx->dri2.read_stamp);
 
-	nouveau_state_emit(ctx);
+	if (ctx->NewState & _NEW_BUFFERS)
+		_mesa_update_state(ctx);
 }

src/mesa/drivers/dri/nouveau/nv10_context.c

@@ -24,6 +24,7 @@
  *
  */
 
+#include "main/state.h"
 #include "nouveau_driver.h"
 #include "nouveau_context.h"
 #include "nouveau_fbo.h"
@@ -184,6 +185,9 @@ nv10_clear(struct gl_context *ctx, GLbitfield buffers)
 			nv17_zclear(ctx, &buffers);
 		else
 			nv10_zclear(ctx, &buffers);
+
+		/* Emit the zclear state if it's dirty */
+		_mesa_update_state(ctx);
 	}
 
 	nouveau_clear(ctx, buffers);